Go to crucial.com and download and run their system scanner. It will tell you all you need to know about you ram.
Yep. Nifty little app that one is!
Yep. DDR3 PC3-10600, DDR3 PC3-8500 Available slots:0. Total Slots: 2. Looks like it's 2 2GB Dimms. If I do the upgrade, one or both will be replaced, then.